US4924596A - Method for correcting slippage during wireline depth measurements - Google Patents
Method for correcting slippage during wireline depth measurements Download PDFInfo
- Publication number
- US4924596A US4924596A US07/344,207 US34420789A US4924596A US 4924596 A US4924596 A US 4924596A US 34420789 A US34420789 A US 34420789A US 4924596 A US4924596 A US 4924596A
- Authority
- US
- United States
- Prior art keywords
- depth
- counter
- wheel
- wireline
- encoder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000005259 measurement Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000003247 decreasing effect Effects 0.000 claims description 5
- 230000003213 activating effect Effects 0.000 claims 1
- 238000012937 correction Methods 0.000 abstract description 13
- 238000012935 Averaging Methods 0.000 description 4
- 230000009897 systematic effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/04—Measuring depth or liquid level
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/06—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness specially adapted for measuring length or width of objects while moving
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/04—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving
- G01B7/042—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving for measuring length
Definitions
- an object of the present invention to provide a method for measuring wireline depths which corrects for encoder wheel slippage in a manner which does not corrupt the measurement from a non-slipping encoder wheel.
- the present invention capitalizes on the fact that slippage errors are unidirectional. That is, the errors due to slippage lessen the depth measurement.
- the present invention also makes use of the fact that the encoder wheels rarely slip simultaneously.
- the slower wheel is assumed to have slipped and its accumulated depth is corrected. This is done by accumulating the pulses (after wheel correction) from each wheel separately and comparing the two. If one encoder wheel gets too far ahead of the other, the one that is behind is assumed to have slipped so its depth count is adjusted to reflect the same of amount of cable movement as the faster wheel.
- the FIGURE is a flow chart of the slippage correction method in accordance with the present invention.
- the depth pulses from both encoder wheels are detected by a micro-controller.
- the micro-controller accumulates these pulses and performs wheel correction by deleting or doubling pulses periodically according to the specified wheel correction. For example, if the wheel correction is 1 in 10,000, every 10,000th pulse is counted twice, or if the wheel correction is -2 in 10,000, every 5,000th pulse is not counted. Wheel corrections may cause the depth from a wheel to be either too high or too low at any instant, so wheels that correction. In a system such as described in U.S. Pat. No.
- either wheel can be either 0.1 inch too high or low, so that a 0.2-inch total difference between non-slipping wheels is possible.
- the difference between two agreeing wheels may be even larger because the wheels are not synchronized so that each 0.1 inch of movement will be detected from one wheel first and then from the other.
- Another 0.2 inch in error can be due to second-order effects like cable roll and angle of the tack from the winch. Therefore, the two encoder wheels may disagree by up to 0.5 inch in depth even if there is no slippage on either.
- the micro-controller constantly monitors the counts from each encoder.
- the 0.5-inch limit used in the present embodiment of the present invention is exemplary, of course, and depends on the physical characteristics of the actual system.
- Pulses from encoder wheels 1 and 2 are detected at steps 10a and 10b, respectively.
- a depth counter corresponding to that wheel is incremented (where incrementing is to be taken to mean the addition of either a positive or negative value depending upon the direction of rotation of the wheel) at either step 11a or 11b.
- Counter C1 keeps track of encoder wheel 1
- counter C2 keeps track of encoder wheel 2.
- the present values of each counter are compared at step 12.
- the limit value LV is a pulse count corresponding to 0.5 inch. If the difference between the counters does not exceed the limit value LV, counting continues as before by returning to steps 10a and 10b.
- the limit value is exceeded, whether depth is currently increasing or decreasing is determined at step 13. That is, it is determined whether the wireline is being pulled from or put into the bore hole. If depth is increasing and the depth measured by counter C1 exceeds that of counter C2 as determined at step 14b, then wheel 2 must have slipped.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Geophysics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
Abstract
Description
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/344,207 US4924596A (en) | 1989-04-27 | 1989-04-27 | Method for correcting slippage during wireline depth measurements |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/344,207 US4924596A (en) | 1989-04-27 | 1989-04-27 | Method for correcting slippage during wireline depth measurements |
Publications (1)
Publication Number | Publication Date |
---|---|
US4924596A true US4924596A (en) | 1990-05-15 |
Family
ID=23349510
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/344,207 Expired - Fee Related US4924596A (en) | 1989-04-27 | 1989-04-27 | Method for correcting slippage during wireline depth measurements |
Country Status (1)
Country | Link |
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US (1) | US4924596A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2658285A1 (en) * | 1990-02-15 | 1991-08-16 | Artos Engineering Co | APPARATUS FOR CONDUCTIVE MEASUREMENT AND MEASUREMENT, CLOSED REGULATION LOOP, AND METHOD FOR OPERATING THE SAME. |
US5317812A (en) * | 1992-03-06 | 1994-06-07 | Artos Engineering | Wire feeding and measuring apparatus |
US5351531A (en) * | 1993-05-10 | 1994-10-04 | Kerr Measurement Systems, Inc. | Depth measurement of slickline |
US5433122A (en) * | 1993-01-27 | 1995-07-18 | Benninger Ag | Method of measuring the length of winding material running onto a winding beam |
US5546672A (en) * | 1994-11-09 | 1996-08-20 | Schlumberger Technology Corporation | Magnetic mark detection |
US5978749A (en) * | 1997-06-30 | 1999-11-02 | Pile Dynamics, Inc. | Pile installation recording system |
DE102014118263A1 (en) | 2014-12-09 | 2016-06-23 | Bernd Piecha | Shielding for the head or face area, primarily with weight compensation |
US12105481B1 (en) | 2023-03-15 | 2024-10-01 | Horizontal Wireline Services, Llc | System and method for automatic depth positioning of wire conveyed operations |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4052599A (en) * | 1974-04-25 | 1977-10-04 | Bethlehem Steel Corporation | Method and apparatus for determining coil sheet length |
US4117600A (en) * | 1975-07-22 | 1978-10-03 | Schlumberger Technology Corporation | Method and apparatus for providing repeatable wireline depth measurements |
US4179817A (en) * | 1975-07-22 | 1979-12-25 | Schlumberger Technology Corporation | Method and apparatus for providing repeatable wireline depth measurements |
US4447955A (en) * | 1981-12-04 | 1984-05-15 | Loepfe Brothers Limited | Method for determining the length of filamentary materials, such as yarn, wound upon a cross-wound package by means of a friction drive and a grooved drum |
US4718168A (en) * | 1985-12-19 | 1988-01-12 | Kerr Measurement Systems, Inc. | Cable length measurement correction system |
-
1989
- 1989-04-27 US US07/344,207 patent/US4924596A/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4052599A (en) * | 1974-04-25 | 1977-10-04 | Bethlehem Steel Corporation | Method and apparatus for determining coil sheet length |
US4117600A (en) * | 1975-07-22 | 1978-10-03 | Schlumberger Technology Corporation | Method and apparatus for providing repeatable wireline depth measurements |
US4179817A (en) * | 1975-07-22 | 1979-12-25 | Schlumberger Technology Corporation | Method and apparatus for providing repeatable wireline depth measurements |
US4447955A (en) * | 1981-12-04 | 1984-05-15 | Loepfe Brothers Limited | Method for determining the length of filamentary materials, such as yarn, wound upon a cross-wound package by means of a friction drive and a grooved drum |
US4718168A (en) * | 1985-12-19 | 1988-01-12 | Kerr Measurement Systems, Inc. | Cable length measurement correction system |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2658285A1 (en) * | 1990-02-15 | 1991-08-16 | Artos Engineering Co | APPARATUS FOR CONDUCTIVE MEASUREMENT AND MEASUREMENT, CLOSED REGULATION LOOP, AND METHOD FOR OPERATING THE SAME. |
US5060395A (en) * | 1990-02-15 | 1991-10-29 | Artos Engineering Company | Closed loop wire feeding and measuring apparatus and method of operating same |
US5317812A (en) * | 1992-03-06 | 1994-06-07 | Artos Engineering | Wire feeding and measuring apparatus |
US5433122A (en) * | 1993-01-27 | 1995-07-18 | Benninger Ag | Method of measuring the length of winding material running onto a winding beam |
US5351531A (en) * | 1993-05-10 | 1994-10-04 | Kerr Measurement Systems, Inc. | Depth measurement of slickline |
US5546672A (en) * | 1994-11-09 | 1996-08-20 | Schlumberger Technology Corporation | Magnetic mark detection |
US5978749A (en) * | 1997-06-30 | 1999-11-02 | Pile Dynamics, Inc. | Pile installation recording system |
DE102014118263A1 (en) | 2014-12-09 | 2016-06-23 | Bernd Piecha | Shielding for the head or face area, primarily with weight compensation |
US12105481B1 (en) | 2023-03-15 | 2024-10-01 | Horizontal Wireline Services, Llc | System and method for automatic depth positioning of wire conveyed operations |
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AS | Assignment |
Owner name: SCHLUMBERGER TECHNOLOGY CORPORATION, A TX CORP., T Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:VACHON, GUY;REEL/FRAME:005078/0088 Effective date: 19890417 |
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Year of fee payment: 4 |
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REMI | Maintenance fee reminder mailed | ||
LAPS | Lapse for failure to pay maintenance fees | ||
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
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FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20020515 |